BANGKOK: In a "major boost" to bilateral security cooperation, India and Thailand today signed the much awaited extradition treaty after 20 years of intense negotiations, with New Delhi eyeing to bring back a key aide of underworld don Dawood Ibrahim.

The two countries also firmed up a pact to effectively deal with money laundering, terror financing and ratified a treaty on the Transfer of Sentenced Persons, enabling both sides to swap prisoners after they have served a portion of their prison terms.

The two sides signed seven agreements, including cooperation in space technology and education after wide ranging talks between Prime Minister Manmohan Singh and his Thai counterpart Yingluck Shinawatra.

"Our growing security cooperation received a major boost today. The Extradition Treaty, concluded after two decades of negotiations, and a memorandum on cooperation in anti-money laundering send a major signal of our shared commitment to combating terrorism, organised crime, drug trafficking and counterfeiting," Singh said.

He added, "We also agreed to continue strengthening defence relations, including through exchanges, exercises and joint patrolling".

Thailand has long been a refuge for underworld dons and outlawed groups.

India is seeking the early extradition of Munna Zingada, a Dawood aide, who is wanted in numerous cases by the Mumbai Police. But he has been in a Bangkok prison for about a decade with both India and Pakistan claiming him.

Zingada attacked Chhota Rajan in 2001 on the orders of Chhota Shakeel, Dawood's right-hand man. Rajan was severely injured in the attack but escaped from a hospital here to avoid deportation to India.

The cooperation between Thai and Indian law-enforcing agencies had led to the arrest of Santosh Shetty, one of Rajan's close aides here in 2011.